#define _CRT_SECURE_NO_WARNINGS  1
#include <stdio.h>

int main()
{
    printf("I will learn C++ well!\n");
    return 0;
}

int main()
{
    int a, b, c, d = 0;
    scanf("%d %d %d %d", &a, &b, &c, &d);
    printf("%d", (a + b - c) * d);
    return 0;
}

int main()
{
    printf("Practice makes perfect!\n");
    return 0;
}

int main()
{
    double a, b, c = 0;
    scanf("%lf %lf %lf", &a, &b, &c);
    printf("%.2lf %.2lf", a + b + c, (a + b + c) / 3);
    return 0;
}

int main()
{
    double a, b, c = 0;
    scanf("%lf %lf %lf", &a, &b, &c);
    double average = (a + b + c) / 3;
    if (average >= 60)
        printf("NO");
    else
        printf("YES");
    return 0;
}